Lattice distortion and octupole ordering model in CexLa 1-xB6

Katsunori Kubo, Yoshio Kuramoto

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


Possible order parameters of the phase IV in CexLa 1-xB6 are discussed with special attention to the lattice distortion recently observed. A Γ5u-type octupole order with a finite wave number is proposed as the origin of the distortion along the [111] direction. The Γ8 crystalline electric field (CEF) level splits into three levels by a mean field with the Γ5u symmetry. The ground and highest singlets have the same quadrupole moment, while the intermediate doublet has an opposite sign. It is shown that any collinear order of the Γ5u-type octupole moment accompanies the Γ5g-type ferro-quadrupole order, and the coupling of the quadrupole moment with the lattice induces the distortion. The cusp in the magnetization at the phase transition is reproduced, but the internal magnetic field due to the octupole moment is smaller than the observed one by an order of magnitude.

Original languageEnglish
Pages (from-to)1859-1862
Number of pages4
Journaljournal of the physical society of japan
Issue number8
Publication statusPublished - 2003 Aug
Externally publishedYes


  • CeLaB
  • Internal field
  • NdB
  • NpO
  • Octupole ordering
  • Rare-earth hexaboride
  • Thermal expansion

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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